Several cases of parvovirus have occurred in puppies in the region in recent days with Western Bay of Plenty Council's animal services officers urging people to ensure their dogs are vaccinated against the disease.
Four puppies with parvovirus found this week by officers were so ill they had to be euthanised and checks were being done on the adult dogs.
Canine parvovirus, known as parvo, is a highly contagious viral disease that has a big impact on puppies but is also seen in adult dogs, especially elderly or unwell dogs.
The virus attacks the blood cells, affecting puppies' growth and the intestines, preventing the absorption of nutrients. A dog infected with the virus may not present symptoms for up to seven days.
Infected dogs shed the virus in their faeces and body fluids. The virus is very stable and can survive for months in the environment.